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# Copyright 2012 Logilab SA <contact@logilab.fr>
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# Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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# Octobus <contact@octobus.net>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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#####################################################################
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### Extension helper ###
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#####################################################################
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from __future__ import absolute_import
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from . import (
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commands,
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error,
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extensions,
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pycompat,
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registrar,
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)
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from hgdemandimport import tracing
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class exthelper(object):
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"""Helper for modular extension setup
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A single helper should be instantiated for each module of an
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extension, where a command or function needs to be wrapped, or a
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command, extension hook, fileset, revset or template needs to be
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registered. Helper methods are then used as decorators for
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these various purposes. If an extension spans multiple modules,
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all helper instances should be merged in the main module.
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All decorators return the original function and may be chained.
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Aside from the helper functions with examples below, several
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registrar method aliases are available for adding commands,
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configitems, filesets, revsets, and templates. Simply decorate
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the appropriate methods, and assign the corresponding exthelper
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variable to a module level variable of the extension. The
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extension loading mechanism will handle the rest.
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example::
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# ext.py
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eh = exthelper.exthelper()
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# As needed:
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cmdtable = eh.cmdtable
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configtable = eh.configtable
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filesetpredicate = eh.filesetpredicate
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revsetpredicate = eh.revsetpredicate
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templatekeyword = eh.templatekeyword
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@eh.command('mynewcommand',
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[('r', 'rev', [], _('operate on these revisions'))],
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_('-r REV...'),
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helpcategory=command.CATEGORY_XXX)
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def newcommand(ui, repo, *revs, **opts):
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# implementation goes here
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eh.configitem('experimental', 'foo',
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default=False,
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)
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@eh.filesetpredicate('lfs()')
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def filesetbabar(mctx, x):
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return mctx.predicate(...)
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@eh.revsetpredicate('hidden')
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def revsetbabar(repo, subset, x):
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args = revset.getargs(x, 0, 0, 'babar accept no argument')
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return [r for r in subset if 'babar' in repo[r].description()]
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@eh.templatekeyword('babar')
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def kwbabar(ctx):
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return 'babar'
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"""
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def __init__(self):
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self._uipopulatecallables = []
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self._uicallables = []
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self._extcallables = []
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self._repocallables = []
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self._commandwrappers = []
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self._extcommandwrappers = []
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self._functionwrappers = []
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self.cmdtable = {}
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self.command = registrar.command(self.cmdtable)
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self.configtable = {}
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self.configitem = registrar.configitem(self.configtable)
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self.filesetpredicate = registrar.filesetpredicate()
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self.revsetpredicate = registrar.revsetpredicate()
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self.templatekeyword = registrar.templatekeyword()
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def merge(self, other):
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self._uicallables.extend(other._uicallables)
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self._uipopulatecallables.extend(other._uipopulatecallables)
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self._extcallables.extend(other._extcallables)
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self._repocallables.extend(other._repocallables)
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self.filesetpredicate._merge(other.filesetpredicate)
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self.revsetpredicate._merge(other.revsetpredicate)
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self.templatekeyword._merge(other.templatekeyword)
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self._commandwrappers.extend(other._commandwrappers)
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self._extcommandwrappers.extend(other._extcommandwrappers)
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self._functionwrappers.extend(other._functionwrappers)
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self.cmdtable.update(other.cmdtable)
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for section, items in other.configtable.iteritems():
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if section in self.configtable:
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self.configtable[section].update(items)
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else:
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self.configtable[section] = items
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def finaluisetup(self, ui):
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"""Method to be used as the extension uisetup
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The following operations belong here:
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- Changes to ui.__class__ . The ui object that will be used to run the
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command has not yet been created. Changes made here will affect ui
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objects created after this, and in particular the ui that will be
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passed to runcommand
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- Command wraps (extensions.wrapcommand)
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- Changes that need to be visible to other extensions: because
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initialization occurs in phases (all extensions run uisetup, then all
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run extsetup), a change made here will be visible to other extensions
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during extsetup
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- Monkeypatch or wrap function (extensions.wrapfunction) of dispatch
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module members
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- Setup of pre-* and post-* hooks
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- pushkey setup
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"""
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for command, wrapper, opts in self._commandwrappers:
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entry = extensions.wrapcommand(commands.table, command, wrapper)
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if opts:
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for opt in opts:
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entry[1].append(opt)
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for cont, funcname, wrapper in self._functionwrappers:
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extensions.wrapfunction(cont, funcname, wrapper)
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for c in self._uicallables:
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with tracing.log(b'finaluisetup: %s', pycompat.sysbytes(repr(c))):
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c(ui)
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def finaluipopulate(self, ui):
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"""Method to be used as the extension uipopulate
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This is called once per ui instance to:
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- Set up additional ui members
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- Update configuration by ``ui.setconfig()``
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- Extend the class dynamically
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"""
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for c in self._uipopulatecallables:
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c(ui)
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def finalextsetup(self, ui):
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"""Method to be used as a the extension extsetup
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The following operations belong here:
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- Changes depending on the status of other extensions. (if
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extensions.find('mq'))
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- Add a global option to all commands
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"""
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knownexts = {}
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for ext, command, wrapper, opts in self._extcommandwrappers:
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if ext not in knownexts:
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try:
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e = extensions.find(ext)
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except KeyError:
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# Extension isn't enabled, so don't bother trying to wrap
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# it.
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continue
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knownexts[ext] = e.cmdtable
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entry = extensions.wrapcommand(knownexts[ext], command, wrapper)
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if opts:
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for opt in opts:
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entry[1].append(opt)
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for c in self._extcallables:
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with tracing.log(b'finalextsetup: %s', pycompat.sysbytes(repr(c))):
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c(ui)
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def finalreposetup(self, ui, repo):
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"""Method to be used as the extension reposetup
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The following operations belong here:
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- All hooks but pre-* and post-*
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- Modify configuration variables
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- Changes to repo.__class__, repo.dirstate.__class__
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"""
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for c in self._repocallables:
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with tracing.log(b'finalreposetup: %s', pycompat.sysbytes(repr(c))):
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c(ui, repo)
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def uisetup(self, call):
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"""Decorated function will be executed during uisetup
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example::
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@eh.uisetup
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def setupbabar(ui):
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print 'this is uisetup!'
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"""
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self._uicallables.append(call)
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return call
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def uipopulate(self, call):
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"""Decorated function will be executed during uipopulate
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example::
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@eh.uipopulate
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def setupfoo(ui):
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print 'this is uipopulate!'
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"""
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self._uipopulatecallables.append(call)
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return call
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def extsetup(self, call):
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"""Decorated function will be executed during extsetup
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example::
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@eh.extsetup
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def setupcelestine(ui):
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print 'this is extsetup!'
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"""
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self._extcallables.append(call)
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return call
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def reposetup(self, call):
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"""Decorated function will be executed during reposetup
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example::
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@eh.reposetup
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def setupzephir(ui, repo):
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print 'this is reposetup!'
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"""
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self._repocallables.append(call)
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return call
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def wrapcommand(self, command, extension=None, opts=None):
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"""Decorated function is a command wrapper
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The name of the command must be given as the decorator argument.
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The wrapping is installed during `uisetup`.
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If the second option `extension` argument is provided, the wrapping
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will be applied in the extension commandtable. This argument must be a
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string that will be searched using `extension.find` if not found and
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Abort error is raised. If the wrapping applies to an extension, it is
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installed during `extsetup`.
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example::
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@eh.wrapcommand('summary')
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def wrapsummary(orig, ui, repo, *args, **kwargs):
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ui.note('Barry!')
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return orig(ui, repo, *args, **kwargs)
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The `opts` argument allows specifying a list of tuples for additional
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arguments for the command. See ``mercurial.fancyopts.fancyopts()`` for
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the format of the tuple.
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"""
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if opts is None:
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opts = []
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else:
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for opt in opts:
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if not isinstance(opt, tuple):
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raise error.ProgrammingError('opts must be list of tuples')
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if len(opt) not in (4, 5):
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msg = 'each opt tuple must contain 4 or 5 values'
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raise error.ProgrammingError(msg)
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def dec(wrapper):
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if extension is None:
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self._commandwrappers.append((command, wrapper, opts))
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else:
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self._extcommandwrappers.append((extension, command, wrapper,
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opts))
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return wrapper
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return dec
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def wrapfunction(self, container, funcname):
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"""Decorated function is a function wrapper
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This function takes two arguments, the container and the name of the
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function to wrap. The wrapping is performed during `uisetup`.
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(there is no extension support)
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example::
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@eh.function(discovery, 'checkheads')
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def wrapfunction(orig, *args, **kwargs):
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ui.note('His head smashed in and his heart cut out')
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return orig(*args, **kwargs)
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"""
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def dec(wrapper):
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self._functionwrappers.append((container, funcname, wrapper))
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return wrapper
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return dec
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